Creating Custom Subtabs To create a custom subtab: Go to Customization > Forms > Subtabs > New. In the Script ID field, enter a unique alphanumeric ID for the custom subtab. For more information about best practices and naming conventions, see Conventions for Naming Custom Objects. For information about changing an existing ID, see Changing the ID of a Custom Object. From the Type list, select the type of record for which you want to create the subtab. If applicable, from the Parent list, select the parent subtab. In the Title field, enter a name for the subtab. Click Save.